Combined friction and spring resistance draft-rigging.



No. 829,994. PATENTED SEPT. 4, 1995.

. E I. E. ocoNNoE. l COMBINED EEIcIIoN AND SEEING RESISTANCE DEAII EIGGING.

APPLICATION FILED JUNE 6, 1906.

yE SHEETS-SHEET 1.

' ms? EN WIWI his ATTO/ENE v5 No. 829,994. l PATENTED SEPT. 4, 1906.

J. E. oooNNoR.

COMBINED EEICTION AND SEEING RESISTANCE DEAE: EIGGING.

APPLICATION FILED `JUNE 6, 1906.

n 2 SHEETS-SHEET 2.

WITNESSES: IN VEN TOR /1/'5 ATTORNEYS -S. elevation, partly in lon itudinal vertical sec- PATENT; orrroia.A

Jorifit .oooNNoaior `onrcAGo,-@1Ltno1s,- AssreNoR row. H. MINER COMPANY; orv Giuridico, ILLiNois, A ooaroaarior orf-minimis.v

cottamgufftljtT-ION;AND .SPRING RESISTANCE, .DRAFT-mesme.

No. "$29,994. Letten-raten.

.ratntedsepa 4, 190e.

application ma @causaal .slsaazoaa provement in Combined Fric'tioi'al'id Spring@ i Resistance Draft-Rigging, of which; the fol lowingis a specification..

My invention .relates to improvements in frictlon-spring draft-rigging.

The object of my `inventlon is to provide ai combined friction and sprin resistance draftriggmg of a strong, simple,l e cient, and dura- -ble construction which will operate without danger-of sticking-and in which the friction` resistance'will always beexerted in a constant rat1o :to the load or thrust. My invention conslsts 1n the means I, employ to practically accomplish this object or reSult-that is to l"say,'1t consists, in connection .with the side latesjor vstop castings, vthe draw-bar, and

ont follower, of a longitudinally-movable friction case or 'shell serving also to contain the spring, and as an abutment for the rear endof the spring a ,pair of longitudinallymovable `.friction-shoes havin a slidabl'ev friction enga ement with the frlction shell or case, a pair. o rockingspreaders having circular'xontacting faces to force the frictionl' shcesagainst the'friction shell or case, the -circil'arfaces of the rockers -being .struck vabout a center in advance ofthe pivotal ccn-` -ter of the' rockers, so asto maintain a constantj ratio between the 'thrust or load upon. therockers and the partor component thereofjjtlfansmitted to thel friction-shoes land a gressure-block interposed between the drawarl or 'front follower, and the rockers and lha a circular bearing-face engaging cir-. 4f'cular lbe therockers turn about their pivotal centers aring-faces on the rockers,so that as the ratio oftheload or thrust transmitted through the rockers to .the friction-shoeswill be maintained constant.

My invention also .consists in the novel construction. of parts and devices and in' the novel combinations of parts and deviiies here'- in shown and described.' v In the accompanying drawings, forming a part ofthis speciiication, Figure 1 is a side tion, of a friction-dra rigging embodying trissseeuoa 011.11m 3 a (5f-Fig. '2'. rig.. a is a ,detail perspective,view'ofonefof the-frictionone of the'rockers.

operation.

' In the drawings, A' represents the center sills or frame-pieces of the carto which the'drafte is. attached. B represents the-side p ates or stop-castings, having front and rear stops?) b; C is .the draw-bar; C', the draw barstrap or extension; D, .the longitudinally-c movable friction case or. shell; E, the spring; F, the friction shoes or slides; G, .the rockers or rocking spreaders by which the friction shoes or slidesv are forced into close frictional 1 engagement with the friction shell or case D ;-v

H, the'pressure-block, and K the front vfollower. The spring E is preferably contained in the rear end of the lon itudinally-movable friction case or shell D, -t e end orbottom d of' which case serves also as. a follower or "abutment for the. rear end ofy thesprin'g. The front end of the spring abuts against the 'end of the, fric-tion shoes or slides F, or, if preferred or desired, afollower or bearingplate E, as illustrated in.Fig. 7, may be interposed between the front end of the spring and the rear end of the friction shoes or slides F. The `lfriction shoes or slides F have pivot seats or bearings to receive the -pivot ends g of the rockers or rocking spreaders'G. r:lhe shoes'F are also preferably vfurnished with central strengthening-ribs f', .which fit in slotsE g in the rockers G. Thel rochers Grhave' circular contacting faces g2, which are.

struck about a'center 'g3 in advance of the 4pivotal center of-motion .gi ofthe rockers, '(see Fig. 7,) so that as the rockersroll to-l gether a constant ratio willv be' maintainedv tion-shoes F and the friction shell or case D, i

against -which the 4friction-shoes slide, thus causingthe frictional 'resistance to always maintain al constant ratio to' the load or thrust upon the .draw-bar. To further, securethis result,- the pressure-block H has a my inventionr Fig. 2 is av plan .view partly in horizontal section. F1g. 3 1s a vertical circular bearing-'face h, which contacts with corresponding circular -befaringfaces g5 on Fig,A 6 is a detail perspect1ve view o f the pressure-block, and liig.'v 7 is a 'detail-diagrammatic view illustrating the Ico IPS

i ed laterally or at right angles to the frictionponent of the longitudinal thrust of the and the rocking movement of the rockers are the rockers, so that as the rockers turn about. l their pivotal centers the leverage thereof' against the friction-shoes will no t be changed. ltwill or' course be understood that the rockers G have but a very slight movement, just enough to tighten the friction-shoes F against the friction case or shell D; but as the friction-shoes and friction. case or shell will necessarily wear more or less in operation, as will also the rockers and pressure-blockto some extent, provision is made for such turning movement of the rockers as may-occur incident to. wear and other causes.

As by my construction and'coperative combination of parts 4the component of the longitudinal load or thrust Vupon the drawbar, which is transmitted laterally or at right angles to the friction-shoes F, is always maintained'constant, there is no danger of the friction devices sticking or failing to properly cushion in conjunction with the spring E the blows or thrust upon the drawbar. l

l As the contacting faces g2 of the rockers G are circular, as the rockers roll together their point of contact with each other remains the saine distance in advance of the pivotal. centers g4 94, about which the'ro'ckers G G turn, and as the contacting faces g5 g5 of the rockers G G with the contacting face 7L of the pressure-block H are also circular the center of pressure of the draw-bar against the rockers in respect to the pivotal center of the rockers also remains constant, and as a consequence it is a constant ratio or comdraw-bar against the rocker which is impartshoes F Flby the rockers G G. g ln this connection it will of course be understood that the lateral movement of the friction-shoes but slight-simply sufhoient to take up the play.

l claimf l. in a friction-spring draft-rigging, the combination with the side lates or stopcastings, draw-bar and draw-liar strap or eX- tension, oia longitudinally--inovable friction case or sliellfa spring in said case or shell, longitudinally-movable friction-shoes in said case or shell at one end of said spring, a pair of rockers pivotally mounted on said frictionshoes and having circular contacting Jfaces struck about a center in advance ot the pivotal center of said rockers anda movable pressure-block interposed between said rockersd and thc draw-bar, substantially as specifie 2. In a friction-spring draft-rigging, thecombination with the side plates or stop-castings, draw-bar and draw-bar strap or extension, of a longitudinally-movable friction case or shell, a spring in said case or shell, longitudinally movable friction shoes in said case orshell at one end of said spring, a pair ot rockers pivotally mounted on said iiictioiishoes and having circular contacting faces struck about a center in advance of the pivy Aotal center oi' said rockers, and a movable f pressure-block interposed between said rockers and the draw-bar, said pressure-block having acircular bearing-lace and said rock# ers having 'circular bearing-faces engaging the circular' bearing-face of the pressure-block, substantially as specified.

3. ln a" friction-spring draft-rigging, the combination with the side lates or ,stopcastings, draw-bar and draw-har strap or eX- tension, of a longitudinally-movable friction case or shell, a spring in said case or shell, longitudinally-movable frictioneshoes in said caseor shell at one end of said spring, a pair of rockers pivotally mounted on said frictionshoes and having circularcontacting faces struck about a center in advanceof the pivotal center oii'said rockers and a movable pressure-block interposed between said rockers and the draw-bar, anda follower inter-.

posed between the draw-bar and the pressure-block, substantially as speciiied.

fi. In a. friction-spring draft-rigging, the combination with the side plates or stop-castings, draw-bar and draw-bar strap or extension, of a longitudinally-movable friction case orshell, a spring in said case or shell, longitudinally-movable friction-shoesin said case or shell at one end of said spring, a pair of rockers pivotally mounted on said frictionshoes andd having circular contacting faces4 struck about a center in advance of the pivotal center of said rockers and a movable pressure-- block interposed between said rockers and the draw-bar, said pressure-block having a circular bearing-face and said rockersliaving 'circular bearing-faces engagii'ig the circular bearing-faces of the pressure-block and a follower interposedbetween,the pressure-block and the draw-bar, substantially as specified. j y

5. In arictionspring draft-rigging, the combination with the side plates or stop-castings, draW-bar and draw-bar strap or extension, of a longitudinally-movable friction-case or shell, a spring in said case or shell, longitudinally-movable friction-shoesin said case or shell at one end of said spring, a pair ot rockers pivotally mounted on said friction-shoes and having circular contacting faces struck about a center in advance of the pivotal center of said rockers and a movable Ipressureblock interposed between said rockers and the draw-bar, said. friction-shoes having central strengthening-ribs and said rockers having slots to receive said ribs, substantially as specified.

6. In a friction-'spring draft-rigging, the combination with the side plates or stopcastings, draw-bary and draw-bar strap or eX- tension, of a longitudinally-movable Jfrictioncase or shell, a spring therein, sliding'lfriction# IIO shoes in said case or shell at one end ofsaid force exerted upon the friction-shoes to bear s ring, rocking spreaders bearing against said a constant ratio to the longitudinal 'thrust or xo ,s oes toforce the sameinto i'ictlonal engageload upon the draw-bar, substantially as t' l,ment with said oase or shell, a pressure-block specied. v

bearing against said rocking spreaders and JOHN F. OCONNOR. 'f actuated 'by the draw-bar, said rookimr Witnesses:

spreaders and `pressure-block being provided H. M. MUNDA'Y,

-with `means to cause the lateral or spreading v PEARL ABRAMS. 

